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Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
425 AM CDT TUE JUL 22 2014

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
230930-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
425 AM CDT TUE JUL 22 2014 /525 AM EDT TUE JUL 22 2014/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  SCATTERED THUNDERSTORMS...WHICH MAY PRODUCE:
   WIND GUSTS IN EXCESS OF 60 MPH.
   QUARTER SIZE HAIL.
   HEAVY DOWNPOURS...LEADING TO LOCALIZED FLOODING.
   FREQUENT CLOUD TO GROUND LIGHTNING.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER FAR NORTHERN
  ILLINOIS LATE THIS AFTERNOON AND CONTINUE TO SLIDE SOUTHEAST
  ACROSS THE OUTLOOK AREA THROUGH TONIGHT.

  DISCUSSION:

  A VERY WARM AND HUMID AIR MASS WILL SET THE STAGE FOR THE
  POTENTIAL OF SEVERE WEATHER LATER TODAY. THE ATMOSPHERE WILL
  BECOME UNSTABLE BY MIDDAY...HOWEVER THE PRESENCE OF A WARM LAYER
  ALOFT WILL INITIALLY LIMIT THE COVERAGE AND INTENSITY OF
  THUNDERSTORMS. SHORTLY AFTER 4 PM CDT THE WARM LAYER ALOFT IS
  EXPECTED TO SLOWLY WEAKEN. ADDITIONALLY A FRONTAL BOUNDARY
  WILL BE DROPPING SOUTH FROM WISCONSIN...AND IT IS EXPECTED JUST
  AHEAD OF THIS BOUNDARY THUNDERSTORMS WILL BE ABLE TO DEVELOP
  AND MOVE EAST TO SOUTHEAST ACROSS NORTHERN ILLINOIS AND NORTHWEST
  INDIANA THIS EVENING. SOME OF THESE THUNDERSTORMS WILL HAVE THE
  POTENTIAL TO PRODUCE DAMAGING WINDS AND LARGE HAIL. THE VERY
  HIGH MOISTURE CONTENT TO THE ENVIRONMENT SUGGESTS THAT SOME
  THUNDERSTORMS COULD EASILY PRODUCE TORRENTIAL DOWNPOURS...AND
  MAY RESULT IN LOCALIZED FLOODING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE WILL BE CHANCES FOR THUNDERSTORMS FRIDAY NIGHT THROUGH MONDAY.

HAZARDOUS BEACH CONDITIONS ARE LIKELY MIDDAY WEDNESDAY THROUGH
MIDDAY THURSDAY ALONG THE ILLINOIS AND INDIANA SHORELINE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ACTIVATION MAY BE NEEDED THIS EVENING.

&&

$$



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